Collapsible ladder



(No Model.) 7 Y W. W. HARRIS. GOLLA PSIBLE LADDER;

N0. 449,159. Patented M.a.r.'31, 1891.

WI T

[\JESSES AT'fd NE/S UNITED STATES ATENT- OFFICE.

WILLIAM \V. HARRIS, OF CIIARLES'IOIVN, NEIV HAMPSHIRE.

COLLAPSIBLE LADDER.

SPECIFICATION forming part of Letters Patent No. 449,159, dated March31, 1891.

Application filed October 13, 1890. Serial No, 367,892. (No model.)

To all whom it may concern.-

Be itknown that I, WILLIAM W. HARRIS, of Charlestown, in the county ofSullivan, State of New Hampshire, have invented a certain new and usefulImprovement in Collapsible Ladders, of which the following is adescription sufficiently full,.clear, and exact to enable any personskilled in the art or science to which said invention appertains to makeand use the same, reference being had to the accompanying drawings,forming part of this specification, in which Figure 1 is a frontelevation of a section of my improved ladder represented as open; Fig.2, an edge elevation of the same; Fig. 3, a longitudinal section of oneof the rungs.

Like letters of reference indicate corresponding parts in the differentfigures of the drawings.

My invention relates especially to folding or collapsible ladders; andit consists in certain novel features hereinafter fully set forth andclaimed, the object being to produce a more simple, cheap, and effectivedevice of this character than is now in ordinary use.

The nature of the improvement will be readily understood by allconversant with such matters from the following explanation.

In the drawings, A represents the side bars, and B the rungs. The sidebars are preferably rectangular in cross-section, and the rungs B arepivoted to one face thereof by means of split pins (1. These pins havean eye f, adapted to encircle the rungs and rest in a groove g, (seeFig. 3,) the body of the pins passing horizontally through the said barsA. A ring it is passed onto the points of the pin at the face of theside bars opposite the eye f and the split points z of the pins arespread, as shown in Fig. 2, preventing said pins from being Withdrawnfrom the said bars While permitting it to rotate freely thereon. One ormore of the rungs B are extended to project beyond the said bars A, asshown at m in Fig. 1, and, to each side bar a hook p is pivoted inposition to overlap the end of said rung and prevent the ladder fromaccidentally collapsing when open.

The ladder as thus constructed is exceedingly durable, only a small holeor opening in the side bars being necessary to receive the pins d, andthe strain resulting from'weight on the rungs being in a line parallelto said holes instead of at an angle thereto, as when the rung isinserted directly in the side bars, as in ladders of ordinaryconstruction. The pins may readily be removed to replace a broken rungwithout detaching the side bars from the remaining rungs.

Having thus explained my invention, what I claim is- 1. A collapsibleladder com prising side bars and rungs pivoted thereto by split pins,arranged substantially as specified.

2. In a collapsible ladder, the side bars in combination with groovedrungs, and the split pins d, having an eye ffor receiving said rungs,all being arranged to operate substantially as described.

3. In a device of the character described, the side bars A, incombination with the rungs B, provided with the grooves g, the pins d,fitted to rotate in said side bars and provided with an eye f, and therungs h for securing said pins.

4. In a collapsible ladder, the side bars connected by rungs pivotedthereto by split pins passing through said bars, one or more of the saidrungs being extended beyond the bars to receive a hook or catch,substantially as and for the purpose set forth.

WILLIAM W. HARRIS. lVitnesses:

- EDWARD OLOOTT,

GEORGE OLOOTT.

